public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "gcc-bugzilla at al42and dot me" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/108195] New: Incorrect implicit conversion when assigning initializer_list to std::vector Date: Wed, 21 Dec 2022 17:48:15 +0000 [thread overview] Message-ID: <bug-108195-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108195 Bug ID: 108195 Summary: Incorrect implicit conversion when assigning initializer_list to std::vector Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: gcc-bugzilla at al42and dot me Target Milestone: --- The following code compiles fine with Clang 15 and GCC 12 and outputs "3" when run. With GCC 13, it produces a warning about narrowing conversion and constructs a vector of length 2. $ cat test.cpp #include <iostream> #include <vector> struct S { S(bool) {} }; int main() { std::vector<S> v = { true, false, true }; std::cout << v.size() << std::endl; } $ g++ -std=c++17 test.cpp -o test test.cpp: In function ‘int main()’: test.cpp:11:44: warning: narrowing conversion of ‘(((void)const bool [3]{true, false, true}), ((const bool*)(&<anonymous>)))’ from ‘const bool*’ to ‘bool’ [-Wnarrowing] 11 | std::vector<S> v = { true, false, true }; | ^ test.cpp:11:44: warning: narrowing conversion of ‘(((const bool*)(&<anonymous>)) + 3)’ from ‘const bool*’ to ‘bool’ [-Wnarrowing] $ ./test 2 Using a constructor instead of the assignment avoids this problem: std::vector<S> v { true, false, true }; // works fine Creating an initializer_list separately is also ok: std::initializer_list<S> il = { true, false, true }; std::vector<S> v = il; // no problem here, vector has three elements Tested with GCC fdc7469cf597ec11229ddfc3e9c7a06f3d0fba9d. Bisection points to d081807d8d70e3e87eae41e1560e54d503f4d465 (PR105838).
next reply other threads:[~2022-12-21 17:48 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-12-21 17:48 gcc-bugzilla at al42and dot me [this message] 2022-12-21 17:53 ` [Bug c++/108195] [13 Regression] " pinskia at gcc dot gnu.org 2022-12-21 17:57 ` pinskia at gcc dot gnu.org 2022-12-21 17:59 ` pinskia at gcc dot gnu.org 2022-12-22 7:19 ` [Bug c++/108195] [13 Regression] Incorrect implicit conversion when assigning initializer_list to std::vector since r13-4564-gd081807d8d70e3 rguenth at gcc dot gnu.org 2023-01-23 19:12 ` jason at gcc dot gnu.org 2023-01-23 21:13 ` cvs-commit at gcc dot gnu.org 2023-01-23 21:13 ` jason at gcc dot gnu.org 2023-01-24 10:02 ` redi at gcc dot gnu.org
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=bug-108195-4@http.gcc.gnu.org/bugzilla/ \ --to=gcc-bugzilla@gcc.gnu.org \ --cc=gcc-bugs@gcc.gnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).